80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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// Copyright (c) 2021 Facebook
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#include <linux/bpf.h>
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#include <linux/perf_event.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bperf_u.h"
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__uint(key_size, sizeof(__u32));
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__uint(value_size, sizeof(struct bpf_perf_event_value));
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__uint(max_entries, 1);
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} diff_readings SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
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__uint(key_size, sizeof(__u32));
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__uint(value_size, sizeof(struct bpf_perf_event_value));
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__uint(max_entries, 1);
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} accum_readings SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(key_size, sizeof(__u32));
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__uint(value_size, sizeof(__u32));
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} filter SEC(".maps");
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enum bperf_filter_type type = 0;
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int enabled = 0;
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SEC("fexit/XXX")
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int BPF_PROG(fexit_XXX)
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{
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struct bpf_perf_event_value *diff_val, *accum_val;
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__u32 filter_key, zero = 0;
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__u32 *accum_key;
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if (!enabled)
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return 0;
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switch (type) {
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case BPERF_FILTER_GLOBAL:
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accum_key = &zero;
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goto do_add;
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case BPERF_FILTER_CPU:
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filter_key = bpf_get_smp_processor_id();
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break;
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case BPERF_FILTER_PID:
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filter_key = bpf_get_current_pid_tgid() & 0xffffffff;
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break;
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case BPERF_FILTER_TGID:
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filter_key = bpf_get_current_pid_tgid() >> 32;
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break;
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default:
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return 0;
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}
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accum_key = bpf_map_lookup_elem(&filter, &filter_key);
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if (!accum_key)
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return 0;
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do_add:
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diff_val = bpf_map_lookup_elem(&diff_readings, &zero);
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if (!diff_val)
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return 0;
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accum_val = bpf_map_lookup_elem(&accum_readings, accum_key);
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if (!accum_val)
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return 0;
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accum_val->counter += diff_val->counter;
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accum_val->enabled += diff_val->enabled;
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accum_val->running += diff_val->running;
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return 0;
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}
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char LICENSE[] SEC("license") = "Dual BSD/GPL";
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